package com.itheima.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * 根据用户名查找用户信息
 */
@Component
public class SpringSecurityUserService implements UserDetailsService {
    @Reference
    private UserService userService;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        com.itheima.pojo.User user = userService.findByUsername(username);
        //如果没查到,告诉安全框架
        if(user==null) return null;
        //定义一个list集合用于封装查询到的权限和角色
        List<GrantedAuthority> list=new ArrayList<>();
        //根据查询到的用户查找对应的角色信息和权限信息
        Set<Role> roles = user.getRoles();
        //遍历角色信息获取每个角色信息对应的权限信息
        for (Role role : roles) {
            //授予用户角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //授予角色权限
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        //把查询到的用户信息返回给安全框架
        UserDetails userDetails=new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
        return userDetails;
    }
}
